chemistry jul 2006 eng

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(EnJlish,Venlon )

CodeNo. 34~NS

Instructions: 1 ) The question paper has four Parts.

11) Part A carries 10 marks. Each question carries one mark. .

Part B carries 20 marks. Each question carrtes two marks.

Part C carries 40marks. Each question carrtes five marks.

In Part D- D 1 carries 10 marks and D 2 carries

10marks. Each question ofD2 carrtes ftve marks.

ill) Write balanced chemical equations and draw diagrams

wherever necessary.

PART-A

Note: 1 ) Answerall the 10questions.

11) Questions have to be answered inone word or inone

sentence each. Each question carries one mark,

10 x 1 = 10

1. Name the catalyst used inthe contact process.

2. Givean examplefor bidentate ligand.

3. WriteelectronicconfigurationofHelium molecule.

4. Givethe conditionfor an alkene to exhibit gecmetrtcal Jsomertsm.

5. WhichIsthe.most reactive cycloalkane?

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CodeNo. 34-NS 10

,6. Giveequation for converting methyl iodide to Grignard reagent.

7. Givethe formula of alanine.

8. Which is the conjugate acid 0(S2-?

9. What is a semipermeable membrane?

10. .How is half-lifeperiod,ofa reaction related to the order?

PART-B

Note: j) Answer any ten questions.

:Ii) Each question carries twomarks. 10 x 2 = 20

11. Metal oxides are unstable at high temperatures. Explain using "Ellingham

diagram".

12. Give the IUPACname qf K 4 [ Fe (CN) 6 ] . What is the co-ordination

number of the central metal ion init ?

13. Explain dehydrating property of concentrated sulphuric acid with an

example.

14. What is Clemmensen reduction? Giveone example.

15. Give the IUPACnames of

j) CH3 - NH- C2H 5

il ) ,CH3COCH3 •



11 Code No. 34-NS}\~

16. How do you convert isopropyl chloride to propene? Give equation.

17. What is a triglyceride? Give the general structure of a simple triglyceride. ;

18~ Mention two differences between colloids and true solutions. -,

19. Give two limitations ofArrhenius theory of electrolytic dissociation.

20. State Hardy-Schulze rule.

21. Rate constant of a reaction doubles when the temperature is increased

from 27°C to 37°C. Calculate the energy of activation of the reaction.

22. Define entropy. Give its SI unit.

v'

PART-C

I. Answer any two of the following : ,2 x 5 = 10

23. a)

b)

Explain dsp 2 hybridisation incuprammonium sulphate.

Calculate the EANof Iron inK3 [ Fe (CN) 6 ] . 3+2

24. a) Explain Ramsay Rayleigh's method for the isolation of noble

gases from air.

b) "Give two important differences between bonding and

antibonding molecular orbitals. 3 + 2

25. a) How is Ammonia manufactured by Haber's process?

b) What is the function of limestone and coke in the smelting of

Haematite ? 4 + 1

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12

. II.. Answer.any three ofthe following:~

3x5=15

26. a) Explainthe mechanism ofnttratton ofbenzene.

b) What Isnegative inductive effect? Giveone example, 3+2

27. a) HowIs phenolmanufactured from·cumene?

b). Howis propane prepared byWurtz r~ction ? 3+2

28. a) Howdoyou convert

1 ) phenol to salicylaldehyde?

ti ) aceticacid to acetamide ?

b) What is denaturation ofprotein ? 4 + 1

29. a) Elucidate the open chain structure ofglucose.

b)Explatn Aldolcondensationwith an example. 3+2

III. Answer any three ofthe following: 3 x 5 = 15

30. a)' Define standard electrode potential .. Calculate the electrode

potential of copper electrode dipped in0·1 MCuSO4 at 25°C.

oE Ou = = 0·34 v.

. b) Derive the equation of Ostwald's dilution law for a weak

electrolyte. 3+2



13

31. a) State the Second law of thermodynamics.

.CodeNo. 34,.NS

b) How is the relative lowering of vapour pressure of a solution

determined by Ostwald and Walker's dynamic method? 1 + 4-

32. a) State Faraday's Second law of electrolysis.

b) Calculate the pH of 0·001 M formic acid, if its dissociation

constant Ka is 1·77 X 10-4 at 298 K.

." c) What are Lewisacids ? 2+2+1

33. a) Explain the buffer action of a basic buffer solution made of

NH4 OH and NH4Cl.

b) Explain Electrophoresis. 3+2

34. a) Discuss ·the application of common ion effect and solubility

product ( K 5P 1 in the selective precipitation of fourth group

basic radicals.

b) Define osmotic pressure. Write van't Hoffs equation for osmotic.

pressure. 3+2

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.Code No. 34-NS 14

PART-D

IV. Answer anyone of the following: 1 x 10 = 10

35. a) i) Explainthe diamagnetic behaviour ofzinc.

11) Name the metal used in the extraction of Ag -from

argenttferrous lead by Parke's process. 2 + 1

b) i) Write.the unit cell ofa body centred cube (BCCl.Calculate

the number of particles per unit cell.

11) What is the pH of 10-2 MNaOH? 3 + 1

c) i) What is a chiral carbon atom?

11) Explain the action ofnitrous acid onmethylamine. 1+ 2

36. a) Write the energy leveldiagram of'oxygenmolecule. Show that it

is a paramagnetic molecule. 3·

b) What is a dipeptide? Write its structure. 2

c) i) A first order reaction .is half complete in. 46 mmutes.

.~

Calculate the time taken for 250/0 completion of the

reaction.

11). What is pseudo first order reaction ? Giveone example.

3+2



15 CodeNo.34-NS

V. Answerany two of the following: 2 x 5 = 10

37. a) Howis p-bromo-acetanilideis prepared in the laboratory from

aeetanfhde ?

b) Howis Biuret test conducted? 3+2

38. Describe the experiment to show that acid hydrolysis of methyl

acetate followskinetics offirst order: . 5

39. How wiil you estimate the amount of potassium permanganate

~dtssolved in 1 dm 3 of the solution using standard oxalic acid

solution? Writeequation forthe reaction. 5

chemistry jul 2006 eng

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